#include <bits/stdc++.h>
using namespace std;
int main()
{
long long n,s=0;
cin>>n;
if(n>300)
{
s+=10000*(n-300);
n=300;
}
if(n>200)
{
s+=5000*(n-200);
n=200;
}
if(n>100)
{
s+=3000*(n-100);
n=100;
}
s+= 2000 * n;
cout<<s;
}
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